Electro Technical Council of Ireland

National Rules for Electrical Installations:

(Reference to Chapters, Sections, Paragraphs, Tables and Annexes correspond to those contained in the National Rules for Electrical Installations, Fourth Edition ET101:2008.

This summary of the Rules, based on the Fourth Edition, lays down the requirements for the design, erection and proper functioning of electrical installations so as to ensure safety of persons, livestock and property against dangers and damage that may arise in the reasonable use of electrical installations.

Please Note: ETCI issued an Amendments, Corrigenda and Errata list to ET101:2008, Fourth Edition, referenced 06/2009, on 18.11.2009. Download this list (.pdf 214kB). ETCI has also issued other notices on the National Rules. Click here to see a listing of these notices.


These Rules apply to electrical circuits supplied at nominal voltages up to and including 1000V a.c. or 1500V d.c. which form part of installations in residential, commercial, industrial or public premises, or of installations contained in prefabricated buildings, caravans and halting sites, as well as installations for specialised purposes, such as those in agricultural and horticultural holdings.

They do not apply to electrical equipment for traction in automobiles or aircraft or on board ships, to installations in mines and quarries, systems for distribution of electrical energy to the public, power generation or transmission for such systems, radio interference suppression equipment or lightning protection of buildings.

The ETCI, as the Irish National Committee of CENELEC, the European Committee for Electrotechnical Standardisation, participates in the work of harmonising the rules for electrical installations which must be implemented by all countries concerned. More than half of the technical content of the Rules is now harmonised throughout the CENELEC region.

The format of the Rules is the same as that adopted by most European countries. The Rules comprise seven distinct parts:
Part 1: Scope, Object and Fundamental Principles.
Part 2: Definitions.
Part 3: General Characteristics.
Part 4: Protection for Safety.
Part 5: Selection and Erection of Equipment.
Part 6: Verification and Certification.
Part 7: Requirements for Special Installations or Locations.

Part 4 contains the fundamentals of safety for installations. These include measures for protection against shock, earthing, thermal effects generated by installations, short-circuits, overloads, fire and earth faults.

Part 5 contains the practical requirements for design and construction of installations. These include comprehensive rules for wiring systems and a substantial set of tables giving current ratings for various types of cables in differing situations. Earthing and bonding are covered.

Part 6 specifies the tests that must be carried out on the completed installation in order to verify compliance.

Part 7 contains rules for special situations - bathrooms, swimming pools, saunas, farms, earthing of IT equipment, caravans and caravan parks.

Notices Issued by ETCI on the National Rules:

2013.12.23: Information Bulletin from the National Wiring Rules Committee (ETCI TC2)
2009.11.19: Electrical Installations containing older wiring systems that do not comply with the colour code specified in the current National Rules.
2009.11.18: Amendments, Corrigenda and Errata list to ET101:2008, Fourth Edition, referenced 06/2009.
2009.11.06: Guidelines for the certification of electrical installations that were begun before 30.09.2009, i.e. the implementation date of the Fourth Edition.

Fundamental Principles for Safety of Electrical Installations:

These Rules are intended to protect persons, livestock and property against risks arising from the reasonable use of electrical installations, particularly against shock currents and excessive temperatures likely to cause fires, burns and other injurious effects, including risks of physical injury from electrically-driven mechanical equipment.

See also the ESB Safety Pages: